Hampshire · England
Upper Street New Build Mastic
Professional new build mastic in and around Upper Street, with every bit of old sealant taken out first and a 12-month guarantee.
- Frame joints opening as the plaster dries
- Worktop and upstand sealant coming away
- Beads laid onto grit and dust from the build
New build mastic in Upper Street
Across Upper Street, we work for both new-home owners and the builders handing those homes over. One shower or a whole phase of plots, the method doesn’t change: cut out, clean, prime where needed and reseal neatly. Typical jobs include worktop and upstand sealant coming away and beads laid onto grit and dust from the build, on windows & doors, show homes and skirting & floors.
Older homes in small places like Upper Street often have timber floors that move with the seasons, so skirting and threshold joints need a flexible sealant rather than a rigid filler.
You get a one-year guarantee, the same in Upper Street as everywhere else we work.
- Place
- Upper Street (SP6)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What new build mastic looks like in Upper Street
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In and around Upper Street, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Upper Street is in Hampshire. Whether you are in the middle of Upper Street or further out, we cover new build mastic for every kind of property, from flats and houses to offices and hotels. We cover 683 towns and villages across Hampshire. For nearby work, see our Southampton page.
Postcode districts we cover here for new build mastic: SP6. Other places close to Upper Street include Breamore (1 mile south-east), Upper Burgate (1 mile south), Woodgreen (2 miles east), Lower Burgate (2 miles south) and Tinkers Cross (2 miles south). Within a short drive, we also cover Totton (13 miles east), Romsey (14 miles east), Ringwood (8 miles south), Ashley (15 miles south-east), North Baddesley (15 miles east) and St Leonards (10 miles south).
Around Upper Street
Around Upper Street, our work takes us to homes and buildings near Bat and Ball pub and The Burgate School and Sixth Form, among other places. Well-known places in the area include Fordingbridge Museum (2.5 miles south) and Salisbury District Hospital (5.5 miles north).
Questions from Upper Street
Will you come out to Upper Street?
Yes. Upper Street is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is there a guarantee on new build mastic in Upper Street?
All our work, in Upper Street and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Which products do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Who should fix failed sealant in a new build?
Start with the builder if you are in the snagging or warranty period. Once that’s done, or if they will not put it right, we can reseal it properly.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
Should I wait before resealing?
It depends on whether water is getting through. Failed seals in wet areas need doing now, but cosmetic gaps can wait for movement to slow.
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Open a window or run the fan after bathing
- Get a leaking seal dealt with straight away
- Avoid scourers and strong chemicals on sealant
- Don’t seal over failed sealant yourself
Avoid standing on the rim of the bath or the edge of the tray in the first few weeks. If a bath or tray moves when you stand in it, get it looked at.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Small faults turn into leaks if left over time.
Why it’s worth doing now in Upper Street
A tube of sealant from the DIY shop will not fix the cause: dust, no primer and old sealant left in the joint. Cutting out, cleaning and priming are what make the difference. Where a wall is exposed, as many are in small places like Upper Street, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Why book with us
- We agree the colour with you first
- Every job guaranteed for a year
- Quality sealants from Arbo and Everbuild
- Domestic, commercial and hotel work
See how sealant jobs are priced and our reviews.
Work for landlords, hotels and businesses
If you manage several properties in or around Upper Street, several properties can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we are fully insured for the work.
The process
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to several days, depending on the number of plots. Somewhere as small as Upper Street, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at why each joint failed, including any movement.
- Old sealant is cut out and the joints cleaned.
- Joints are dried and primed where the product calls for it.
- Baths are filled with water, then the new sealant is applied.
- We check every joint and leave you with the cure times.
Preparing for the visit
- Move anything stored near the joints
- Tell us if parking is tricky
- Mention any sign-in or site rules at work premises
Get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved.
Read more
How the job changes by surface
Skirting and floors
Gaps under skirting are one of the most common new-build snags. A flexible sealant closes it without cracking like caulk.
Plot handovers
Good preparation at handover saves snagging later. Dust from the build is removed first and prime where the product needs it.
Places near Upper Street
What else we do in Upper Street
Signs you need new build mastic in Upper Street
New homes are full of moisture from plaster, screed and concrete, and it dries out over the first couple of years. Drying timber shrinks and pulls joints apart.
The problems people usually mention when they call include:
- Sealant that never bonded to the surface
- Gaps between new skirting and floors
- Smeared, uneven beads picked up at snagging
- New-build shower sealant that has already split
For jobs in and around Upper Street, choosing the right material for each joint is as important as a tidy finish.
Questions to ask before you book
- What preparation is included
- Which sealant they’ll use, and why
- How long the guarantee is
- Which colour the sealant will be
DIY versus a professional finish
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.